The effects of size and content of cerium oxide nanoparticles on a composite sensor for hydroxyl radicals detection
The effects of size and content of cerium oxide nanoparticles on a composite sensor for hydroxyl radicals detection
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DOI：
10.1016/j.snb.2020.128467
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发表时间：
2020-10-15
影响因子：
8.4
通讯作者：
Alba-Rubio, Ana C.
中科院分区：
文献类型：
--
作者：
Duanghathaipornsuk, Surachet;Alateeq, Faisal A. O.;Alba-Rubio, Ana C.
用氧化铈纳米颗粒和氧化石墨烯（CeNP/GO）复合材料修饰丝网印刷碳电极，作为检测羟基自由基（中心点OH）的传感装置。采用沉淀法合成了CeO2纳米粒子（CeNPs），并采用低温溶液法制备了CeO2 /GO复合材料。利用扫描透射电镜（STEM）和能量色散光谱（EDS）测定了复合材料上CeNPs的平均尺寸和分布。x射线粉末衍射（XRD）证实了复合材料的组成。利用循环伏安法（CV）表征了复合传感器与Fenton反应产生的(OH)- o中心点的相互作用。使用8、12和16 nm的CeNPs，在CeNP/GO复合材料上分别添加10、25、50、75和90 wt%的CeNPs，研究了CeNPs的大小和含量对(OH)- o中心点传感器响应的影响。在所有测试比例中，具有8 nm CeNP的CeNP/GO复合材料对(OH)- o中心点的传感器响应最大。此外，含有50 wt% CeNPs的复合材料在检测(OH)- o中心点时表现出最大的传感器响应。以8 nm的CeNP与氧化石墨烯的比例为50:50，检测限最低，为0.085 mM。据认为，当负载比增加到50% wt%以上时，氧化石墨烯的含量和CeNPs的聚集会降低，导致电流变化较小，传感器性能较差。
A screen-printed carbon electrode was modified with a composite comprised of cerium oxide nanoparticles and graphene oxide (CeNP/GO) to be employed as a sensing device for hydroxyl radicals (center dot OH) detection. CeO2 nanoparticles (CeNPs) were synthesized using a precipitation method, and the CeNP/GO composites were fabricated using a low-temperature solution process. Scanning Transmission Electron Microscopy (STEM) and Energy Dispersive Spectroscopy (EDS) were used to determine the average size and the distribution of CeNPs on the composites. X-Ray powder Diffraction (XRD) confirmed the composition of the CeNP/GO composites. Cyclic voltammetry (CV) was used to characterize the interaction of the composite sensor with (OH)-O-center dot generated by the Fenton reaction. The effects of size and content of CeNPs on the sensor response with (OH)-O-center dot were examined using 8, 12, and 16 nm CeNPs with loadings of 10, 25, 50, 75, and 90 wt% CeNPs on the CeNP/GO composite. The CeNP/GO composite with 8 nm CeNPs showed the largest sensor response to (OH)-O-center dot for all the tested ratios. Furthermore, the composites containing 50 wt% of CeNPs demonstrated the largest sensor responses in the detection of (OH)-O-center dot. The lowest detection limit (0.085 mM) was observed with the composite consisting of 8 nm CeNPs with a CeNP:GO ratio of 50:50. It is thought that the lower content of GO and the aggregation of CeNPs as the loading ratio increased above 50 wt% resulted in lower current changes and poor sensor performance.